Glen Powell and girlfriend Michelle Randolph turned the highly anticipated Texas-Tennessee game into a date … and we have the pic of them having a blast!

In the photo obtained by TMZ … Glen — who sported an orange University of Texas hat and a matching button-down shirt — beamed at Michelle, who kept it casual in a white tank top and sunglasses.

A witness tells us … the two were seated in a box inside Neyland Stadium along with friends for Saturday’s game in Knoxville.

It was a big game … even President Trump was in the stands for the big showdown pitting the Tennessee Volunteers against the Texas Longhorns … and was booed by onlookers at one point.

We bet Glen’s smile grew even wider after the match-up ended … the undefeated Longhorns beat the Volunteers 20-17.

It makes sense we’d see the couple out and about more often … the actor told TMZ earlier this month that their relationship was “very serious.”